//
// Created by jsjxsy on 2022/8/31.
//
#include <iostream>
using namespace std;
#include <algorithm>
void test01() {
  negate<int> n;
  cout << n(3) << endl;
}

void test02() {
  plus<int> plus;
  cout << plus(10, 3) << endl;
}
int main() {
  test01();
  test02();
  return 0;
}

